<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <p>{{message}}</p>
        <input type="text" v-model="message">
    </div>
</body>
<script src="https://unpkg.com/vue@next"></script>
<script>
    Vue.createApp({
        data() {
            return {
                message: 'hello Vue.js'
            }
        },
        //template:"<div> hello Vue.js<div>"
    }).mount("#app");
</script>
</html>